EP2789864B1 - Screw - Google Patents
Screw Download PDFInfo
- Publication number
- EP2789864B1 EP2789864B1 EP13401026.3A EP13401026A EP2789864B1 EP 2789864 B1 EP2789864 B1 EP 2789864B1 EP 13401026 A EP13401026 A EP 13401026A EP 2789864 B1 EP2789864 B1 EP 2789864B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screw
- threads
- thread
- borehole
- drill hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Revoked
Links
- 239000007787 solid Substances 0.000 claims description 9
- 239000004567 concrete Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims 3
- 239000000203 mixture Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/14—Non-metallic plugs or sleeves; Use of liquid, loose solid or kneadable material therefor
- F16B13/141—Fixing plugs in holes by the use of settable material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
- F16B25/0026—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a hard non-organic material, e.g. stone, concrete or drywall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
- F16B25/0068—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw with multiple-threads, e.g. a double thread screws
Definitions
- the invention relates to a screw for screwing into a wellbore in a solid body, in particular with a substantial proportion of concrete material, certain screw, according to the features of the preamble of claim 1 ( EP 2 098 736 A1 ).
- a screw is already widely used in practice and therefore counts by obvious prior use of the prior art.
- Such screws are designed as thread-cutting, ie when screwing into the borehole in the wall surface of furrowing screws. Although it comes to a cutting of the thread into the borehole when screwing into the well, the holding force of the screw is still significantly increased by the introduced into the borehole, hardenable mass.
- a screw is for example from the DE 198 20 671 A1 known, which is used in particular for the attachment of objects to substrates made of concrete.
- the screw is screwed into a borehole with a hardenable mass.
- the thread flank penetrates only to a small extent in the surrounding ground, whereby a small screwing is necessary. After curing, the thread is partially embedded in solid building material and partially in the hardened mass. As a result, a high pull-out strength is achieved.
- a screw which is inserted into a borehole in a solid but porous material, in particular concrete.
- a cartridge is inserted into the hole and then screwed the thread-cutting screw. Thereby, a curable composition contained in the cartridge is pressed under pressure in a radially formed between the borehole wall and the core of the screw channel into the surrounding material.
- the DE 103 11 471 A1 relates to a thread forming screw for solid hard materials, the thread of which extends partially over the length of the screw shaft and which is screwed into a well with a hardenable mass.
- threaded rods are also known, which are used in a well-made well bore without contact with the inner wall surface of the borehole and fixed there by means of hardenable mass.
- a threaded or anchor rod is out of the EP 0 199 671 B1 known, which describes the use of cartridges in the attachment of such anchor rods in boreholes.
- the curable composition used consists of a two-component system based on acrylate resin.
- the cartridge is used for fixing in the wellbore and then an anchor rod whose outer diameter is smaller than the diameter of the borehole, inserted into the previously cleared by drilling dust by blowing out wellbore. Thereafter, the anchor rod is inserted with impact turning in the hole. In this case, the cartridge is destroyed, mixed their contents and distributed in the borehole. Subsequently, a curing takes place. During this time, the anchor rod must not be touched because it has no own strength or support in the borehole.
- the present invention has for its object to provide a way to significantly improve the fixation of the screw.
- the risk of failure in a faulty mounting should be reduced.
- a screw which has a plurality of, in particular three, threads which do not touch one another and preferably have a constant spacing in the direction of the longitudinal axis of the screw.
- the invention is based on recognizing that the concrete screw preferably has three or more circumferentially equally distributed threads, thereby forming separate, unconnected helical chambers between the adjacent threads and the bore inner wall surface. With respect to any cross-sectional plane, there are always defined three chambers which define a respective portion of the circumference.
- the essential effect according to the invention is the increased safety which can be achieved as a result of incorrect introduction of the hardenable mass.
- a uniform force transmission over the entire circumference of the screw is particularly favored by the fact that the threads are arranged in particular evenly distributed on the circumference and therefore can accommodate a matching amount of the curable volume.
- the fixing forces are thus the same for all threads.
- the screw according to the invention proves to be superior due to the uniform radial fixing forces in the borehole and the associated centering within the borehole.
- the screw according to the invention is suitable both for thread-cutting use as well as for merely touching contact with the inner wall surface . If the inner diameter of the borehole is chosen to be smaller than the diameter of the screw, threading occurs when the screw is screwed into the borehole, whereby the thread acts self-tapping and the holding force is achieved without hardenable mass. When the wellbore is sized appropriately, the threads act as a centering aid by merely contacting the inner wall surface. The fixation of the screw in the borehole is then achieved by the hardenable mass.
- the screw has at least one thread without a thread-forming function when screwed into the borehole, the insertion torques are significantly reduced compared to a thread-cutting screw. Even with such a configuration with at least one compared to the other threads enlarged cross-sectional shape, the advantages of the chamber formation between the following threads are reliably achieved.
- the screw according to the invention can have a high fault tolerance compared to a layout which is not reliably avoidable in practice and inclined with respect to the borehole center axis and, in particular, an unwanted accumulation and thus unequal distribution of the hardenable mass can be avoided.
- the screw is also suitable for a new arrangement in which the screw with the large thread self-tapping, thus furrowing engages the inner wall surface of the borehole, while the remaining threads only complete with the inner wall surface.
- the fixing forces can be significantly increased by the combined non-positive and positive connection without the assembly forces increase undesirably strong.
- the Screw also for direct screwing into the borehole, without the use of a hardenable mass.
- the threads extend at least on a cylindrical shaft portion between a screw head and a screw head facing away from the end portion of the screw, so that the supplied as required to be supplied hardenable mass distributed evenly over the entire longitudinal extent of the screw between the threads and Nevertheless, at the same time a spatial separation of the thread grooves is ensured.
- the end portion is designed as a truncated cone and equipped with an end-side receptacle for an axially protruding insertable cartridge containing the curable composition.
- flank angle of at least the threads coincides with the same diameter, so that the thread-rolling properties are also substantially equal.
- the flank angle can also be adapted to the desired conveying or transporting action for the hardenable mass in a non-trenchant use of the screw.
- the core diameter could vary in the axial direction in such a way that the thread grooves have a matching depth or cross-sectional area, irrespective of the different diameters of the respectively limiting threads, so that they can receive the same amount of the hardenable mass.
- the screw head is equipped with a tool holder.
- advantageous variants can be realized in which the screw head is designed, for example, as a threaded bolt for fixing objects by means of a threaded nut.
- the screw can also be used as a ground anchor, for example.
- the well is cleaned prior to the use of composite anchors or composite screws. If the borehole is freed from the drilling dust or boring grass, no damage to the hardenable mass by the drilling dust occurs.
- the negative influence of the contamination of the hardenable mass is generally of greater influence than the gain in capacity through cutting. Especially with epoxy resins impurities are very negative.
- the distance between a core of the screw and an outer circumference of the respective thread is greater than 1 mm. Due to the primary design of the screw according to the invention with three threads distributed over the screw cross-section, the active reaction area between the screw and the hardenable mass is substantially increased. This effect contributes significantly to the increase in the bearing behavior of the screw. Such an effect is often more important to the load bearing behavior than a furrowed cutting of the threads.
- a screw 1 according to the invention will be described below with reference to FIGS. 1 to 3 explained in more detail, showing the screw 1 in a side view and in a longitudinal and a cross section.
- the screw 1 is intended for screwing into a non-illustrated wellbore in a solid body, wherein the holding force of the screw 1 is determined in the borehole by adding a curable mass to be introduced into the borehole.
- the screw 1 has three threads 2, 3, 4, which are uniformly distributed over the circumference. As in particular in FIG.
- the circumference is divided into three equal circular ring cutouts 5, 6, 7, which are each delimited from each other. If, for example, the mounting errors lead to air entrapment, this is limited in practice to a single one of these circular ring cutouts 5, 6, 7. It is easily understandable that the respective circular ring cutout 5, 6, 7 corresponds to the helical course of the threads 2, 3, 4 following in different cross-sectional planes in the longitudinal direction of the screw 1 assumes different angular ranges. Thus, a supply of the screw 1 is ensured with a sufficient amount of the curable composition over the entire circumference and ensures the desired fixing force even with assembly errors.
- the screw 1 can also be screwed into the borehole without a hardenable mass.
- a first thread 2 with respect to the other threads 3, 4 has a larger circumference, so that the first thread 2 in the borehole is furrowed screwed and the other threads 3, 4 only rest in the inner wall surface of the borehole.
- all threads 2, 3, 4 extend from the cylindrical shaft 8 with a constant core diameter D into one truncated cone-shaped end portion 9.
- a screw head 10 is equipped with a standard tool holder and is thus suitable for universal use for different applications.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Joining Of Building Structures In Genera (AREA)
Description
Die Erfindung betrifft eine zum Einschrauben in ein Bohrloch in einem Massivkörper, insbesondere mit einem wesentlichen Materialanteil aus Beton, bestimmte Schraube, entsprechend den Merkmalen aus dem Oberbegriff des Anspruchs 1 (
Eine Schraube ist beispielsweise aus der
Aus der
Die
Weiterhin ist auch aus der
Darüber hinaus sind auch noch Gewindestangen bekannt, die in ein mit deutlichem Übermaß hergestelltes Bohrloch ohne Kontakt zu der Innenwandfläche des Bohrlochs eingesetzt und dort mittels aushärtbarer Masse fixiert werden.In addition, threaded rods are also known, which are used in a well-made well bore without contact with the inner wall surface of the borehole and fixed there by means of hardenable mass.
Eine Gewinde- bzw. Ankerstange ist aus der
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Möglichkeit zu schaffen, die Fixierung der Schraube wesentlich zu verbessern. Insbesondere soll aufgrund der konstruktiven Ausgestaltung der Schraube das Ausfallrisiko bei einer fehlerhaften Montage verringert werden.The present invention has for its object to provide a way to significantly improve the fixation of the screw. In particular, due to the structural design of the screw, the risk of failure in a faulty mounting should be reduced.
Diese Aufgabe wird erfindungsgemäß mit einer Schraube gemäß den Merkmalen des Anspruchs 1 gelöst. Die weitere Ausgestaltung der Erfindung ist den Unteransprüchen zu entnehmen.This object is achieved with a screw according to the features of claim 1. The further embodiment of the invention can be found in the dependent claims.
Erfindungsgemäß ist also eine Schraube vorgesehen, die mehrere, insbesondere drei Gewindegänge aufweist, die einander nicht berühren und vorzugsweise einen konstanten Abstand in Richtung der Längsachse der Schraube aufweisen. Die Erfindung geht dabei von der Erkenntnis aus, dass die Betonschraube vorzugsweise drei oder mehr am Umfang gleichverteilte Gewindegänge aufweist, wodurch zwischen den benachbarten Gewindegängen und der Bohrlochinnenwandfläche separate, miteinander nicht verbundene helixförmige Kammern gebildet werden. In Bezug auf eine beliebige Querschnittsebene sind dort stets drei Kammern definiert, die einen jeweiligen Anteil des Umfangs begrenzen. Der wesentliche erfindungsgemäße Effekt ist die dadurch erzielbare erhöhte Sicherheit gegenüber einem fehlerhaften Einbringen der aushärtbaren Masse. Wenn es in der Praxis zu unerwünschten Lufteinschlüssen kommt, beschränken sich bei der erfindungsgemäßen Schraube derartige Lufteinschlüsse, wie praktische Versuche bereits überzeugend bestätigt haben, auf einen einzelnen der mehrere miteinander nicht verbundenen helixförmigen Zwischenräume zwischen benachbarten Gewindegängen, also auf eine einzige Gewindenut. Bezogen auf die Querschnittsebene ist bei derartigen Montagefehlern bei mehreren Gewindegängen daher nur ein anteiliger Umfangsabschnitt von dem Lufteinschluss betroffen, während die übrigen Gewindegänge mit der erforderlichen Menge der aushärtbaren Masse versorgt werden. Bezogen auf die Längserstreckung der Schraube ist diese also auch dann über den gesamten Umfang von der aushärtbaren Masse eingeschlossen, wenn eine einzelne Gewindenut zwischen zwei Gewindegängen nicht oder nicht ausreichend mit der entsprechenden aushärtbaren Masse versorgt ist, sodass in der Praxis in jedem Fall eine ausreichende Fixierkraft erreicht wird.According to the invention, therefore, a screw is provided which has a plurality of, in particular three, threads which do not touch one another and preferably have a constant spacing in the direction of the longitudinal axis of the screw. The invention is based on recognizing that the concrete screw preferably has three or more circumferentially equally distributed threads, thereby forming separate, unconnected helical chambers between the adjacent threads and the bore inner wall surface. With respect to any cross-sectional plane, there are always defined three chambers which define a respective portion of the circumference. The essential effect according to the invention is the increased safety which can be achieved as a result of incorrect introduction of the hardenable mass. When in practice undesirable air inclusions occur, in the screw according to the invention such air inclusions, as practical experiments have already convincingly confirmed, are limited to a single one of the plurality of helical interspaces between adjacent threads, ie a single thread groove. With regard to the cross-sectional plane, in the case of such assembly errors in the case of several threads, therefore, only a proportionate circumferential section is affected by the air inclusion, while the remaining threads are supplied with the required amount of the hardenable mass. Based on the longitudinal extent of the screw so this is then included over the entire circumference of the curable material, if a single thread groove between two threads is not or not sufficiently supplied with the appropriate curable composition, so in practice in each case a sufficient fixing force is reached.
Eine gleichmäßige Kraftübertragung über den gesamten Umfang der Schraube wird insbesondere auch dadurch begünstigt, dass die Gewindegänge am Umfang insbesondere gleichverteilt angeordnet sind und daher eine übereinstimmende Menge des aushärtbaren Volumens aufnehmen können. Die Fixierkräfte sind somit für alle Gewindegänge gleich.A uniform force transmission over the entire circumference of the screw is particularly favored by the fact that the threads are arranged in particular evenly distributed on the circumference and therefore can accommodate a matching amount of the curable volume. The fixing forces are thus the same for all threads.
Wenn man berücksichtigt, dass bereits geringe Abweichungen von einer vertikalen Orientierung der Schraube dazu führen können, dass sich die aushärtbare Masse bei einer Schraube nach dem Stand der Technik vornehmlich in einem bestimmten Umfangsabschnitt sammelt, so kann dies bei der erfindungsgemäßen Schraube durch die mehreren Kammern zuverlässig vermieden werden.Taking into account that even small deviations from a vertical orientation of the screw can cause the curable composition in a screw according to the prior art collects primarily in a certain peripheral portion, this can be reliable in the screw according to the invention through the plurality of chambers be avoided.
Dabei kann es von Vorteil sein, wenn in die verschiedenen Gewindenuten unterschiedliche aushärtbare Massen, insbesondere also mit unterschiedlichen chemischen oder physikalischen Eigenschaften, eingeführt werden, um so durch die Kombination unterschiedlicher chemischer Bindungen in dem Bohrloch optimale Fixierkräfte zu erzeugen.In this case, it may be advantageous if different hardenable masses, in particular with different chemical or physical properties, are introduced into the different thread grooves so as to produce optimal fixing forces by combining different chemical bonds in the borehole.
Aber auch bei einem korrekten Montageprozess erweist sich die erfindungsgemäße Schraube aufgrund der gleichmäßigen radialen Fixierkräfte in dem Bohrloch und der damit verbundenen Zentrierung innerhalb des Bohrlochs als überlegen.But even with a correct assembly process, the screw according to the invention proves to be superior due to the uniform radial fixing forces in the borehole and the associated centering within the borehole.
Indem zumindest ein Gewindegang in das Bohrloch furchend eindrehbar und zumindest ein weiterer Gewindegang in der Innenwandfläche des Bohrlochs lediglich berührend bzw. tangierend in das Bohrloch eindrehbar ist, eignet sich die erfindungsgemäße Schraube sowohl für den gewindeschneidenden Einsatz als auch für einen lediglich berührenden Kontakt mit der Innenwandfläche. Sofern der Innendurchmesser des Bohrlochs kleiner als der Durchmesser der Schraube gewählt wird, kommt es beim Eindrehen der Schraube in das Bohrloch zu einem Gewindefurchen, wobei das Gewinde selbstschneidend wirkt und die Haltekraft ohne aushärtbare Masse erreicht wird. Wenn das Bohrloch mit entsprechender Größe ausgeführt wird, wirken die Gewindegänge durch eine lediglich berührende Anlage an der Innenwandfläche als Zentrierhilfe. Die Fixierung der Schraube in dem Bohrloch wird dann durch die aushärtbare Masse erreicht.By at least one thread in the borehole furrowed screwed and at least one further thread in the inner wall surface of the borehole is only screwed touching or tangent into the borehole, the screw according to the invention is suitable both for thread-cutting use as well as for merely touching contact with the inner wall surface , If the inner diameter of the borehole is chosen to be smaller than the diameter of the screw, threading occurs when the screw is screwed into the borehole, whereby the thread acts self-tapping and the holding force is achieved without hardenable mass. When the wellbore is sized appropriately, the threads act as a centering aid by merely contacting the inner wall surface. The fixation of the screw in the borehole is then achieved by the hardenable mass.
Indem die Schraube zumindest einen Gewindegang ohne eine beim Eindrehen in das Bohrloch gewindefurchende Funktion aufweist, sind die Eindrehmomente gegenüber einer gewindeschneidenden Schraube deutlich reduziert. Auch bei einer solchen Ausgestaltung mit zumindest einer gegenüber den übrigen Gewindegängen vergrößerten Querschnittsform werden die Vorteile der Kammerbildung zwischen den folgenden Gewindegängen zuverlässig erreicht.Since the screw has at least one thread without a thread-forming function when screwed into the borehole, the insertion torques are significantly reduced compared to a thread-cutting screw. Even with such a configuration with at least one compared to the other threads enlarged cross-sectional shape, the advantages of the chamber formation between the following threads are reliably achieved.
Es hat sich gezeigt, dass die erfindungsgemäße Schraube gegenüber einer in der Praxis nicht zuverlässig vermeidbaren, gegenüber der zu der Bohrlochmittelachse geneigten Anordnung eine hohe Fehlertoleranz aufweist und insbesondere dennoch eine unerwünschte Ansammlung und damit ungleiche Verteilung der aushärtbaren Masse vermieden werden kann.It has been found that the screw according to the invention can have a high fault tolerance compared to a layout which is not reliably avoidable in practice and inclined with respect to the borehole center axis and, in particular, an unwanted accumulation and thus unequal distribution of the hardenable mass can be avoided.
Wenn darüber hinaus ein Gewindegang gegenüber den übrigen Gewindegängen einen größeren Umfang bzw. Hüllkreis aufweist, eignet sich die Schraube auch für eine neue Anordnung, bei der die Schraube mit dem großen Gewindegang selbstschneidend, also furchend in die Innenwandfläche des Bohrlochs eingreift, während die übrigen Gewindegänge lediglich mit der Innenwandfläche abschließen. Die Fixierkräfte können durch die kombinierte kraft- und formschlüssige Verbindung deutlich erhöht werden, ohne dass die Montagekräfte unerwünscht stark ansteigen. Durch diese Ausgestaltung eignet sich die Schraube auch für das direkte Einschrauben in das Bohrloch, ohne den Einsatz einer aushärtbaren Masse.In addition, if a thread over the other threads has a larger circumference or enveloping circle, the screw is also suitable for a new arrangement in which the screw with the large thread self-tapping, thus furrowing engages the inner wall surface of the borehole, while the remaining threads only complete with the inner wall surface. The fixing forces can be significantly increased by the combined non-positive and positive connection without the assembly forces increase undesirably strong. By this configuration, the Screw also for direct screwing into the borehole, without the use of a hardenable mass.
Dabei ist es besonders Erfolg versprechend, wenn sich die Gewindegänge zumindest auf einem zylindrischen Schaftabschnitt zwischen einem Schraubenkopf und einem dem Schraubenkopf abgewandten Endabschnitt der Schraube erstrecken, sodass die bedarfsweise zuzuführende aushärtbare Masse gleichmäßig über die gesamte Längserstreckung der Schraube verteilt zwischen den Gewindegängen eingebracht werden kann und dennoch zugleich eine räumliche Trennung der Gewindenuten sichergestellt ist.It is particularly promising, if the threads extend at least on a cylindrical shaft portion between a screw head and a screw head facing away from the end portion of the screw, so that the supplied as required to be supplied hardenable mass distributed evenly over the entire longitudinal extent of the screw between the threads and Nevertheless, at the same time a spatial separation of the thread grooves is ensured.
Besonders bevorzugt ist der Endabschnitt als ein Kegelstumpf ausgeführt und mit einer stirnseitigen Aufnahme für eine axial vorspringend einsetzbare Patrone ausgestattet, welche die aushärtbare Masse enthält. Hierdurch wird eine besonders einfache Handhabung der Schraube sichergestellt, die hierzu bereits an ihrem stumpfen Ende eine entsprechende Menge der aushärtbaren Masse aufnimmt. Diese wird beim Eindrehen in das Bohrloch gleichmäßig verteilt und gelangt so zu gleichen Teilen in die verschiedenen Gewindenuten. Montagefehler können dadurch vermieden werden.Particularly preferably, the end portion is designed as a truncated cone and equipped with an end-side receptacle for an axially protruding insertable cartridge containing the curable composition. As a result, a particularly simple handling of the screw is ensured, which already receives at its blunt end an appropriate amount of the curable composition. This is evenly distributed when screwing into the hole and thus passes in equal parts in the different thread grooves. Assembly errors can be avoided.
Vorzugsweise stimmt der Flankenwinkel zumindest der Gewindegänge mit demselben Durchmesser überein, sodass die gewindefurchenden Eigenschaften ebenfalls im Wesentlichen gleich sind. Selbstverständlich kann der Flankenwinkel auch an die gewünschte Förder- bzw. Transportwirkung für die aushärtbare Masse bei einer nichtfurchenden Verwendung der Schraube angepasst werden.Preferably, the flank angle of at least the threads coincides with the same diameter, so that the thread-rolling properties are also substantially equal. Of course, the flank angle can also be adapted to the desired conveying or transporting action for the hardenable mass in a non-trenchant use of the screw.
Der Kerndurchmesser könnte in Achsrichtung derart variieren, dass die Gewindenuten unabhängig von den unterschiedlichen Durchmessern der diese jeweils begrenzenden Gewindegänge eine übereinstimmende Tiefe bzw. Querschnittsfläche aufweisen, sodass diese die gleiche Menge der aushärtbaren Masse aufnehmen können. Besonders praxisgerecht ist es hingegen, wenn der jeweilige Kerndurchmesser des Schafts zwischen den Gewindegängen im Verlauf des Schafts zwischen dem Schraubenkopf und dem Endabschnitt konstant ist.The core diameter could vary in the axial direction in such a way that the thread grooves have a matching depth or cross-sectional area, irrespective of the different diameters of the respectively limiting threads, so that they can receive the same amount of the hardenable mass. In contrast, it is particularly practical if the respective core diameter of the shaft between the threads in the course of the shaft between the screw head and the end portion is constant.
Besonders zweckmäßig ist auch eine Ausführungsform der Erfindung, bei welcher der Schraubenkopf mit einer Werkzeugaufnahme ausgestattet ist. Ebenso sind auch vorteilhafte Varianten realisierbar, bei denen der Schraubenkopf beispielsweise als ein Gewindebolzen zur Befestigung von Objekten mittels einer Gewindemutter ausgeführt ist. Hierdurch lässt sich die Schraube beispielsweise auch als Erdanker verwenden.Particularly useful is also an embodiment of the invention, in which the screw head is equipped with a tool holder. Likewise, advantageous variants can be realized in which the screw head is designed, for example, as a threaded bolt for fixing objects by means of a threaded nut. As a result, the screw can also be used as a ground anchor, for example.
Vorzugsweise wird das Bohrloch vor dem Einsatz von Verbundankern bzw. Verbundschrauben gereinigt. Ist das Bohrloch vom Bohrmehl bzw. Bohrabrieb befreit, treten keinerlei Beeinträchtigungen der aushärtbaren Masse durch das Bohrmehl auf.Preferably, the well is cleaned prior to the use of composite anchors or composite screws. If the borehole is freed from the drilling dust or boring grass, no damage to the hardenable mass by the drilling dust occurs.
Sofern sich in dem Bohrloch noch Abrieb der Bohrlochwandung befindet, kann sich dieser mit der sich bereits im Bohrloch befindenden aushärtbaren Masse vermischen. Eine solche Vermischung mit Abrieb wirkt sich dann weitaus weniger nachteilig auf das Last- bzw. Tragverhalten der aushärtbaren Masse aus, wenn eine aushärtbare Masse ohne einen Epoxidharzanteil verwendet wird.If there is still abrasion of the borehole wall in the borehole, this can mix with the hardenable mass already in the borehole. Such a mixture with abrasion then has a much less adverse effect on the load or carrying behavior of the curable composition, if a curable composition is used without an epoxy resin.
Bei einer besonders bevorzugten Variante der erfindungsgemäßen Schraube in Verbindung mit dem Einsatz einer aushärtbaren Masse schneidet diese nicht gewindefurchend in die Bohrlochwandung ein. Hierdurch werden keine zusätzlichen Verunreinigungen durch Abrieb erzeugt, die die aushärtbare Masse negativ beeinflussen. Versuche haben gezeigt, dass in vielen Fällen ein zusätzlich gewindefurchendes Einschneiden der Schraube in die Bohrlochwandung nicht zur Verbesserung des Tragverhaltens beiträgt und die Belastbarkeit unabhängig davon ist, ob die Gewindegänge selbstschneidend bzw. furchend ausgeführt sind oder die Gewindegänge nur an der Bohrlochwandung anliegen.In a particularly preferred variant of the screw according to the invention in conjunction with the use of a hardenable mass, this does not cut into the borehole wall in a thread-forming manner. As a result, no additional impurities are generated by abrasion, which adversely affect the curable composition. Experiments have shown that in many cases an additional thread-cutting cutting the screw into the borehole wall does not contribute to the improvement of the bearing behavior and the load capacity is independent of whether the threads are self-tapping or the threads abut only on the borehole wall.
In der Praxis ist der negative Einfluss der Verunreinigung der aushärtbaren Masse im Allgemeinen von größerem Einfluss als der Zugewinn an Tragfähigkeit durch Einschneiden. Gerade bei Epoxidharzen sind Verunreinigungen sehr negativ.In practice, the negative influence of the contamination of the hardenable mass is generally of greater influence than the gain in capacity through cutting. Especially with epoxy resins impurities are very negative.
Bei dem Gebrauch einer Schraube mit furchendem Einschneiden ohne aushärtbare Masse oder ohne furchendes Einschneiden mit aushärtbarer Masse tragen zwei physikalische Effekte zur Erhöhung des Auszugswiederstands bei. Zum einen ist es das Vergrößern der wirksamen Querschnittsfläche der Schraube, zum anderen das Vergrößern der Reaktionsfläche zwischen der aushärtbaren Masse sowie der Bohrlochwand und der Schraube. Gemäß einer besonders zweckmäßigen Ausgestaltung der Erfindung ist daher der Abstand zwischen einem Kern der Schraube und einem äußeren Umfang des jeweiligen Gewindegangs größer als 1 mm. Durch die vornehmliche Ausbildung der erfindungsgemäßen Schraube mit drei über den Schraubenquerschnitt verteilten Gewindegängen wird die aktive Reaktionsfläche zwischen der Schraube und der aushärtbaren Masse wesentlich erhöht. Dieser Effekt trägt maßgeblich positiv zur Erhöhung des Tragverhaltens der Schraube bei. Ein solcher Effekt ist für das Tragverhalten oftmals wesentlicher als ein furchendes Einschneiden der Gewindegänge.When using a grooving screw without a hardenable mass or without a furrow cutting with hardenable mass, two physical effects contribute to increasing the pullout resistance. On the one hand it is the enlargement of the effective cross-sectional area of the screw, and on the other hand the enlargement of the reaction surface between the hardenable mass and the borehole wall and the screw. According to a particularly advantageous embodiment of the invention, therefore, the distance between a core of the screw and an outer circumference of the respective thread is greater than 1 mm. Due to the primary design of the screw according to the invention with three threads distributed over the screw cross-section, the active reaction area between the screw and the hardenable mass is substantially increased. This effect contributes significantly to the increase in the bearing behavior of the screw. Such an effect is often more important to the load bearing behavior than a furrowed cutting of the threads.
Die Erfindung lässt verschiedene Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips ist eine davon in der Zeichnung dargestellt und wird nachfolgend beschrieben. Diese zeigt in
-
Fig. 1 eine Seitenansicht einer erfindungsgemäßen Schraube; -
Fig. 2 eine entlang der Linie II-II geschnittene Ansicht der inFigur 1 gezeigten Schraube; -
Fig. 3 einen Querschnitt entlang der Linie III-III der inFigur 1 gezeigten Schraube.
-
Fig. 1 a side view of a screw according to the invention; -
Fig. 2 a along the line II-II cut view of inFIG. 1 shown screw; -
Fig. 3 a cross section along the line III-III of inFIG. 1 shown screw.
Eine erfindungsgemäße Schraube 1 wird nachstehend anhand der
Bei einem horizontalen Einsatz der Schraube 1 wirken die drei Gewindegänge 2, 3, 4 als Zentrierhilfe. Es wird somit verhindert, dass die Gewindestange im horizontalen Bohrloch gegen eine untere Bohrlochwandung anliegt und dann nicht mehr über den Querschnitt gleichverteilt mit aushärtbarer Masse ummantelt ist.In a horizontal use of the screw 1, the three
Claims (9)
- Screw (1) intended to be screwed into a drill hole in a solid body, in particular having a substantial concrete material proportion, wherein the retaining force of the screw (1) in the drill hole is increased by the addition of a curable compound to be introduced into the drill hole, wherein the screw (1) has a plurality of, in particular three, threads (2, 3, 4) and an end portion (9) embodied as a truncated cone, characterized in that the threads (2, 3, 4) are arranged in an evenly distributed manner around the circumference and all of the threads (2, 3, 4) extend between a screw head (10) and the end portion (9) remote from the screw head (10).
- Screw (1) according to Claim 1, characterized in that the screw (1) cuts into a drill hole, predrilled with a core diameter, with all of the threads (2, 3, 4) or individual threads (2, 3, 4), and behaves like a concrete screw without the addition of curable compound.
- Screw (1) according to Claim 1 or 2, characterized in that at least a first thread (2) is able to be screwed in in a manner digging into the drill hole and at least one further thread (3, 4) is able to be screwed in in a manner merely contacting the inner wall surface of the drill hole, in that the first thread (2) has a larger diameter than the further threads (3, 4).
- Screw (1) according to at least one of the preceding claims, characterized in that the threads (2, 3, 4) extend at least sectionally along a cylindrical shank (8) of the screw (1).
- Screw (1) according to Claim 1, characterized in that the end portion (9) is equipped with an end-side receptacle for a cartridge containing a curable compound, said cartridge being insertable in an axially protruding manner.
- Screw (1) according to at least one of the preceding claims, characterized in that the flank angle of a plurality of threads (2, 3, 4) corresponds.
- Screw (1) according to at least one of the preceding claims, characterized in that the respective core diameter (D) of the shank (8) between the threads (2, 3, 4) is constant along the shank (8) between the screw head (10) and the end portion (9).
- Screw (1) according to at least one of the preceding claims, characterized in that the spacing between a core of the screw (1) and an outer circumference of the respective thread (2, 3, 4) is greater than 1 mm.
- Screw (1) according to at least one of the preceding claims, characterized in that the screw head (10) is equipped with a tool holder.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP13401026.3A EP2789864B1 (en) | 2013-03-15 | 2013-03-15 | Screw |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP13401026.3A EP2789864B1 (en) | 2013-03-15 | 2013-03-15 | Screw |
Publications (3)
Publication Number | Publication Date |
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EP2789864A1 EP2789864A1 (en) | 2014-10-15 |
EP2789864A8 EP2789864A8 (en) | 2014-11-26 |
EP2789864B1 true EP2789864B1 (en) | 2016-09-14 |
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ID=47915638
Family Applications (1)
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EP13401026.3A Revoked EP2789864B1 (en) | 2013-03-15 | 2013-03-15 | Screw |
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Families Citing this family (1)
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EP2789864B1 (en) | 2013-03-15 | 2016-09-14 | SG Holding UG | Screw |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3897713A (en) | 1974-03-06 | 1975-08-05 | Illinois Tool Works | Double-ended stud |
DE2843038A1 (en) | 1978-10-03 | 1980-04-10 | Fischer Artur Dr H C | Wall fixing anchor bolt - has cartridge with two component adhesive at end, which disintegrates on insertion and acts as adhesive filler |
EP0955476A2 (en) | 1998-05-08 | 1999-11-10 | Fischerwerke Arthur Fischer GmbH & Co. KG | Self-tapping screw for insertion into construction elements |
DE20206589U1 (en) | 2002-04-25 | 2002-08-14 | Joker Industrial Co., Ltd., Hsienhsi, Changhua | Anchoring screw with a double head and a triple thread with different thread depths |
DE69920371T2 (en) | 1998-11-02 | 2006-03-02 | Anthony C. Stamford Giannuzzi | Helical masonry anchor with raised anchorage |
EP2354572A1 (en) | 2010-01-18 | 2011-08-10 | Harald Göttlich | Thread moulding screw |
WO2012152237A1 (en) | 2011-05-11 | 2012-11-15 | Uip Universal Innovative Products Gmbh & Co. Kg | Composite anchor screw |
EP2581611A1 (en) | 2011-10-13 | 2013-04-17 | UIP GmbH & Co. KG | Fixing assembly with bi-functional screw |
EP2789864A1 (en) | 2013-03-15 | 2014-10-15 | Holding UG SG | Screw |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3514031A1 (en) | 1985-04-18 | 1986-10-23 | Hilti Ag, Schaan | ACRYLATE RESIN ADHESIVES AND THEIR USE FOR ANCHORINGS |
DE19944602A1 (en) | 1999-05-26 | 2000-11-30 | Toge Duebel A Gerhard Kg | Method for screwing a thread-cutting screw into a borehole and thread-cutting screw for carrying out the method |
US6918727B2 (en) * | 2002-05-01 | 2005-07-19 | Joker Industrial Co., Ltd. | Anchoring screw with double heads and triple threads of different depths of thread |
DE10311471A1 (en) | 2003-03-15 | 2004-09-23 | Fischerwerke Artur Fischer Gmbh & Co. Kg | Thread forming screw for use on foundation formed of hard construction materials e.g. concrete, has each thread root having conical shape that enlarges in diameter towards each thread flank of threaded portion along screwing direction |
GB2455533B (en) * | 2007-12-12 | 2011-08-10 | Excalibur Screwbolts Ltd | A fixing device |
EP2098736A1 (en) * | 2008-03-07 | 2009-09-09 | CCG-Concept Consulting GmbH | System comprising a connecting anchor screw and an adhesive |
-
2013
- 2013-03-15 EP EP13401026.3A patent/EP2789864B1/en not_active Revoked
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3897713A (en) | 1974-03-06 | 1975-08-05 | Illinois Tool Works | Double-ended stud |
DE2843038A1 (en) | 1978-10-03 | 1980-04-10 | Fischer Artur Dr H C | Wall fixing anchor bolt - has cartridge with two component adhesive at end, which disintegrates on insertion and acts as adhesive filler |
EP0955476A2 (en) | 1998-05-08 | 1999-11-10 | Fischerwerke Arthur Fischer GmbH & Co. KG | Self-tapping screw for insertion into construction elements |
DE69920371T2 (en) | 1998-11-02 | 2006-03-02 | Anthony C. Stamford Giannuzzi | Helical masonry anchor with raised anchorage |
DE20206589U1 (en) | 2002-04-25 | 2002-08-14 | Joker Industrial Co., Ltd., Hsienhsi, Changhua | Anchoring screw with a double head and a triple thread with different thread depths |
EP2354572A1 (en) | 2010-01-18 | 2011-08-10 | Harald Göttlich | Thread moulding screw |
WO2012152237A1 (en) | 2011-05-11 | 2012-11-15 | Uip Universal Innovative Products Gmbh & Co. Kg | Composite anchor screw |
EP2581611A1 (en) | 2011-10-13 | 2013-04-17 | UIP GmbH & Co. KG | Fixing assembly with bi-functional screw |
EP2789864A1 (en) | 2013-03-15 | 2014-10-15 | Holding UG SG | Screw |
Also Published As
Publication number | Publication date |
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EP2789864A8 (en) | 2014-11-26 |
EP2789864A1 (en) | 2014-10-15 |
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